Hello

I'm trying follow these steps:
Updating from v3 to latest
1. Backup all your files/database and save them.
2. Download index.php, app/config/config.php and
app/config/database.php
3. Delete all files and folders in yoursmadirectory/ except assets/ and files/
folder to save your uploads
4. Extract the downloaded file.
5. Upload all the files and folders from extracted folder to yoursmadirectory/
6. Once all the files have been uploaded, please delete SMA null file from
yoursmadirectory/ **I can't understand this step, what means delete SMA null file?**
7. Upload the index.php, app/config/config.php and
app/config/database.php saved in step 2 (replace the latest file with these)
8. Please import the files files/db_updates/version one by one starting from the
next version you are updating from using phpmyadmin after selecting your
database. Please import files/db_updates/POS files too, if you have purchased
SMA with POS. **If, I make a new import db, what will happen with my data?**
9. Login to your site and I hope that everything will be fine.

Please more datails to make a good updating.

regards.